New prebuilt linux toolchain x86_64-linux-glibc2.11-4.6

This new toolchain replaces the following toolchains and scripts
in prebuilts/tools/gcc-sdk which call them
  prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6
  prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6

sysroot is upgraded to glibc2.11

Build instructions:
  CC=${AOSP}/prebuilts/tools/gcc-sdk/gcc \
  CXX=${AOSP}/prebuilts/tools/gcc-sdk/g++ \
    ./build-lucid-multilib-toolchain.sh

Change-Id: Ib45332a8cc19464b71acbc7d5173e45d215f1760
3082 files changed